striker



2 Sheets-Sheet I.

(No Model.)

S. STRAKER. MACHINE FOR GRINDING, ORUSHING, 0R DISINTEGRATING GRAIN, &c.

Patented Mar. 14,1893.

THE cams PETERS co PNOTDLITNOY, WASHINGTON. n. c.

(No Model.) 2 SheetsSheet 2.

S. STRAKER.

MACHINE FOR GRINDING, GRUSHING, OR DISINTEGRATING GRAIN, &c.

No. 493,531. Patented Mar. 14, 1893.

* UNITED STATES PATENT OFFICE.

SIDNEY STRAKER, OF LONDON, ENGLAND, ASSIGNOR TO THE CENTRAL CYCLONECOMPANY, LIMITED, OF SAME PLACE.

MACHINE FOR GRINDING, CRUSHING, OR DISINTEGRATING GRAIN, 8w.

SPECIFICATION forming part of Letters Patent No. 493,531, dated March14, 1893. Application filed July 21, 1892. Serial No. 440,806. (Nomodel.)

To all whom it may concern.-

Be it known that I, SIDNEY STRAKER, civil engineer, a subject of theQueen of Great Britain, and a resident of London,F.ngland, have inventedcertain new and useful Improvements in Machines for Grinding, Crushing,or Disintegrating Grain and other Materials, of which the following is aspecification, reference being bad to the accompanying drawings.

My invention relates to mills for grinding crushing or disintegratingcereals and other dry substances.

A very important feature of my invention is the provision of a serratedring or rings of peculiar construction bolted to the casing, facing thebeater, and having an inclined or oblique face against which thematerial to be pulverized is driven by the vanes or arms of the beater.

In the drawings,Figure l, is a sectional elevation of a mill constructedaccording to my invention. Fig. 2, is a vertical sectional view taken onthe line 'y-y Fig. 1. and Fig. 3, is a cross sectional view taken on theline zz Fig. 1.

Referring to the drawings which represent a mill suitable for reducingheavy material not subjected to a preliminary crushing, the letter Bindicates a reducing chamber which is formed within a singlesemi-cylindrical cover or casing and a suitable hollow bed B whichsupports the said cover. The inner circumference of the said cover orcasing is fitted with bars B the ends of which rest in recesses in thesaid drum. The said bars, which are arranged parallel with the drivingshaft F are preferably made of steel and of rectangular cross section.The segmental covers A by which the semi-cylindrical casing is closedare provided with buffers A of india-rubber which bear upon the bars Bto hold them in place. Suitable steel or other springs may besubstituted for the rubber buffers if desired.

B is a channel or chute by which the material to be disintegrated isintroduced into the central portion of the reducing chamber. Upon theinside of the said drum andthe bed, two serrated impinging rings I arebolted in parallel vertical planes, one ring on each side of the fan E.The serrated faces of the said rings are inclined so as to be nearer thefan E at their outer circumference than at their inner circumferences asshown in Fig. 2. Each said ring may be built up of bars or of separateserrated plates or may be made in one piece or in four or more segments.

Screens comprising a series of bars J are arranged in a semi-circle inthe bed 13 and the said bars are retained in place by means which arehereinafter described. The said bars J are arranged with spaces betweenthem so that the series acts as a sieve to grade the crushed ordisintegrated material, which, when sufficiently reduced passes throughthe said spaces and out of the mill through the bottom of the bed B Thesaid means whereby the bars J are secured in place are importantfeatures of this invention and are arranged as follows:-Four segments Jprovided with segmental slots J are secured within the casing B two oneach side thereof. The ends of the the bars J are placed in the saidslots and other segments J containing recesses J are then secured to thesegments J to keep the bars at proper distances apart. This arrangementconstitutes a self-contained screen and is illustrated in Fig.1 and alsoin Fig. 3 which latter is a cross-section through the segments on theline a, z of Fig. 1 showing the bars J in place. The fan or beater shownin this example is an important feature of this invention, and will nowbe described in detail. In the said fan the arms E E are firmly securedin a boss or hub F which is keyed on to the driving shaft F. The-saidboss is provided with holes F a portion of each hole lies radially inthe hub, the other portion being at right angles therewith and parallelwith the driving shaft.

The arms E E are provided with hooked portions E attheir inner endswhich engage with the hub at the places where the said two portions ofeach hole meet. When the said arms are thus engaged with the hub,filling pieces K are placed in the radial portions of the said holeswhen required and act as weights to balance the fan or beater into astate of equilibrium. The filling pieces are of such cross section as tolit the space in each of the holes F which is not occupied by the arms,when the latter are engaged with the TOO hub, so that as long as thefilling-pieces are in place the hooked portions of thearmscannot becomedisengaged. The cotters K are driven through other suitable holesin' thehub to retain the hooked arms in secure engagement with thehub. Thesecotters may be held from displacement by any suitable means. The saidarms E E are either straight or are cranked orbent in the plane ofthedriving shaft and the outer ends of some of the said arms are bentabout their own axes so as to be at an angle with the plane in whichthey travel. The ariangement of the said fan or heaterarms in relationto the aforesaid serrated rings or any other surface is a most importantfeature of my said invention, for by the said arrangement I effect apreliminary disintegration of the material by certain of the said armsand effect a finer and final reduction by other of the said arms. Forthis purpose I make the a1 ms E which are to effect the preliminarydisintegration, of suitable shape, and I arrange them so that thematerial fed into the machine is first reduced between them and portionsof the rings for instance at the inner circumference of the said rings,the said material then passing outward radially across the rings andbeing still further crushed during its outward movement by otherportions of the arms arranged in gradually increasing proximity to thefaces of the rings. I form the other arms E which are to eitect thefinal reduction, so that their ends approach still closer to the saidrings preferably at the outer circumference of the same, so closely, infact, that they are enabled to reduce material which has undergone thepreliminary rtduction by the other arms as aforesaid. lhe position whichthe said arms E" would occupy relatively to the impinging rings is shownin dotted lines in Fig. 1. By

this means the output of the machine is considerably increased ascompared with machines of equal size constructed as has heretofore beencustomary.

. The material to be disintegrated is fed into the reducing chamber B ofthe machine through the channel B, is crushed by the action of thebeater arms E E and theimpinging rings I, and, when sufficiently reducedfalls as aforesaid through the spaces between the bars and out at thebottom of the bed.

What I claim is- 1. In a pulverizing or grinding mill the combinationwith a semi-cylindrical casing forming the upper portion of the reducingchamber, of bars placed around the inner circumference of the saidcasing and resting in recesses therein, and segmental covers havingindia-rubber buffers or steel or other springs to bear upon the saidbars.

2. In a pulverizing or grinding mill the combination with asemi-cylindrical casing forming the upper portion of the reducingchamber, of bars placed around the inner circumference of the saidcasing and resting in recesses therein, segmental covers havingindia-rubber buffers or steel or other springs to bear upon the saidbars, and two serrated impinging rings, one on each side of the fan orbeater, with faces inclined to the plane in which the fan or heaterrotates,substantially as set forth.

3. In a pulverizing or grinding mill the combination with a series ofbars arranged in a semi-circle in the bed with spaces between them, ofsegments slotted segmentally to receive the ends of the said bars, andother segments secured to the first-named segments and provided withrecesses to receive the said bars substantially as set forth.

4. In a pnlverizing or grinding mill, the combination with a series ofbars arranged in a semicircle in the bed with spaces between them, ofsegments slotted segmentally to receive the ends of the said bars, andsupplemental segments provided with recesses to receive said bars,substantially as described.

In witness whereof I have hereunto set my hand this 1st day of July,1892.

SIDNEY STRAKER.

Witnesses:

G. G. BRIDGES, ARTHUR CARRICK.

